Java计算器源码
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Java计算器源码
作者：王晓勃
本计算器仅供交流使用，如有错误，敬请谅解。本计算器参考了网友海上升明月的无私分享（http://hi.baidu.com/haibing123/item/fc7073e1dd7405226cabb837），在此非常感谢。
其中通过自己的理解修改和加入了一些功能
package calculator;import java.awt.BorderLayout;import java.awt.Color;import java.awt.GridLayout;import java.awt.Insets;import java.awt.event.ActionEvent;import java.awt.event.ActionListener;import java.awt.event.KeyEvent;import javax.swing.JButton;import javax.swing.JFrame;import javax.swing.JMenu;import javax.swing.JMenuBar;import javax.swing.JMenuItem;import javax.swing.JOptionPane;import javax.swing.JPanel;import javax.swing.JTextField;public class Calculator extends JFrame implements ActionListener{/** * author 王晓勃 * @param args */JMenuBar cMenuBar = new JMenuBar();JMenu cEdit = new JMenu("编辑(E)");JMenu cView = new JMenu("查看(V)");JMenu cHelp = new JMenu("帮助(H)");JMenuItem cCopy = new JMenuItem("复制(C)");JMenuItem cPaste = new JMenuItem("粘贴(P)");JMenuItem cStandard = new JMenuItem("标准型");JMenuItem cScience = new JMenuItem("科学型");JMenuItem cGroup = new JMenuItem("查看分组");JMenuItem cHelpItem = new JMenuItem("帮助主题");JMenuItem cAboutCalculator = new JMenuItem("关于计算器");JTextField text = new JTextField("0.",20);StringBuffer copyBoard = new StringBuffer(20); //剪贴板StringBuffer buff = new StringBuffer();StringBuffer memory=new StringBuffer(20);//M系列boolean isDouble=false;int preOp,currentOp=0;//标准位double op1=0,op2=0;//操作数JButton bM = new JButton(" ");JButton bOther;JButton bNumber;JButton bOperator;public Calculator(){super("计 算 器");cMenuBar.setOpaque(true); // setOpaque(true);设置控件不透明 setOpaque(false);设置控件透明cEdit.setMnemonic(KeyEvent.VK_E);cCopy.setMnemonic(KeyEvent.VK_C);cPaste.setMnemonic(KeyEvent.VK_P);cCopy.addActionListener(this);cPaste.addActionListener(this);cEdit.add(cCopy);cEdit.add(cPaste);cView.setMnemonic(KeyEvent.VK_V);cView.add(cStandard);cView.add(cScience);cView.addSeparator();cView.add(cGroup);cHelp.setMnemonic(KeyEvent.VK_H);cHelpItem.addActionListener(this);cAboutCalculator.addActionListener(this);cHelp.add(cHelpItem);cHelp.add(cAboutCalculator);cMenuBar.add(cEdit);cMenuBar.add(cView);//cMenuBar.addSeparator(); 如何添加分隔符cMenuBar.add(cHelp);JPanel cTop = new JPanel();text.setHorizontalAlignment(JTextField.RIGHT); //text水平对齐方式text.setEditable(false); //使调用这个函数的控件不能被编辑，如果设为true或者不调用这个函数，则控件可以编辑cTop.add(text);JPanel jp = new JPanel();jp.setLayout(new BorderLayout());JPanel jpLeft = new JPanel();jpLeft.setLayout(new GridLayout(5,1,3,3));bM.setEnabled(false);jpLeft.add(bM);bOther = new JButton("MC");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2)); //setMargin(new Insets(3,2,3,2)) 设置按钮边框和标签之间 相当于起点坐标是3,2,然后后面的3,2表示长为3,高为2的一个矩形jpLeft.add(bOther);bOther = new JButton("MR");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2)); jpLeft.add(bOther);bOther = new JButton("MS");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2)); jpLeft.add(bOther);bOther = new JButton("M+");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2)); jpLeft.add(bOther);JPanel jpRight = new JPanel();jpRight.setLayout(new BorderLayout());JPanel jpRUp = new JPanel();jpRUp.setLayout(new GridLayout(1,3,3,3));bOther = new JButton("BackSpace");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2));jpRUp.add(bOther);bOther = new JButton("CE");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2));jpRUp.add(bOther);bOther = new JButton("C");bOther.addActionListener(this);bOther.setForeground(Color.red);bOther.setMargin(new Insets(3,2,3,2));jpRUp.add(bOther);JPanel jpRDown = new JPanel();JPanel jpRDowns1 = new JPanel();jpRDowns1.setLayout(new GridLayout(4,3,3,2));JPanel jpRDowns2 = new JPanel();jpRDowns2.setLayout(new GridLayout(4,2,3,2));for(int i=9;i>=0;i--){bNumber = new JButton(""+i);bNumber.addActionListener(this);bNumber.setBackground(Color.blue);bNumber.setMargin(new Insets(3,3,3,3));jpRDowns1.add(bNumber);}bOperator = new JButton(".");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns1.add(bOperator);bOperator = new JButton("+/-");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns1.add(bOperator);bOperator = new JButton("/");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("sqrt");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("*");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("%");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("-");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("1/X");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("+");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);bOperator = new JButton("=");bOperator.addActionListener(this);bOperator.setBackground(Color.red);bOperator.setMargin(new Insets(3,3,3,3));jpRDowns2.add(bOperator);jpRDown.setLayout(new BorderLayout());jpRDown.add(BorderLayout.CENTER,jpRDowns1);jpRDown.add(BorderLayout.EAST,jpRDowns2);jpRight.add(BorderLayout.NORTH,jpRUp);jpRight.add(BorderLayout.SOUTH,jpRDown);setJMenuBar(cMenuBar);jp.add(BorderLayout.WEST,jpLeft);jp.add(BorderLayout.EAST,jpRight);add(BorderLayout.NORTH,cTop);add(BorderLayout.SOUTH,jp);}/***计算器 事件处理方法 **/ public void actionPerformed(ActionEvent e){ String str = e.getActionCommand(); // getActionCommand()返回与此动作相关的命令字符串if(str.equals("复制(C)")){String temp = text.getText().trim(); //trim() 返回字符串的副本，忽略前导空白和尾部空白/* replace(int start,int end,String str) * 使用给定 String 中的字符替换此序列的子字符串中的字符。该子字符串从指定的 start 处开始，一直到索引 end - 1 处的字符，如果不存在这种字符，则一直到序列尾部。 * 先将子字符串中的字符移除，然后将指定的 String 插入 start。（如果需要，序列将延长以适应指定的字符串。）*/copyBoard.replace(0,copyBoard.length(),temp);cPaste.setEnabled(true);}else if(str.equals("粘贴(P)")){/*返回此序列中数据的字符串表示形式。分配一个新的 String 对象，并将它初始化，以包含当前由此对象表示的字符串序列。 * 然后返回此 String。对此序列的后续更改不影响该 String 的内容。 */text.setText(copyBoard.toString());}else if(str.equals("帮助主题")){JOptionPane.showMessageDialog(this, " 1.CE :清除文本框 2.BackSpace :回删刚输入数字\n " +"3.C :删除当前计算 4.MC :清除缓冲区\n " +"5.MR :恢复缓冲区的数到文本框 6.MS :将文本框的数存入缓冲区\n" +"7.M+ :将文本框值与缓冲区的数相加但不显示结果 8. 1/x :将文本框中的数据为它的倒数\n" +"9.sqrt:将文本框中的内容求平方根 10.+/- :负数符号");}else if(str.equals("关于计算器")){JOptionPane.showMessageDialog(null,"作者：王晓勃 QQ：670980598\n" +"本计算器仅供交流使用，如有错误，敬请谅解。\n本计算器参考了网友的无私分享，再次非常感谢。\n" );}else if(str.equals("CE")){text.setText("0.");}else if(str.equals("BackSpace")){if(!text.getText().trim().equals("0.")){if(buff.length()!=1&&buff.length()!=0){text.setText(buff.delete(buff.length()-1, buff.length()).toString());}else{text.setText("0.");buff.setLength(0);}}op2 = Double.parseDouble(text.getText().trim());}else if(str.equals("C")){text.setText("0."); //?????op1 = op2 = 0;buff.replace(0, buff.length(), " ");preOp = currentOp = 0;}else if(str.equals("MC")){String temp = " ";memory.replace(0, memory.length(), temp);bM.setText(" ");}else if(str.equals("MR")){text.setText(memory.toString());}else if(str.equals("MS")){String temp = text.getText().trim();memory.replace(0, memory.length(), temp);bM.setText("M");}else if(str.equals("M+")){String temp1 = text.getText().trim();Double num = Double.parseDouble(temp1);String temp2 = memory.toString();num += Double.parseDouble(temp2); temp1 = String.valueOf(num);memory.replace(0, memory.length(), temp1);}else if(str.equals("1/X")){String temp = text.getText().trim();Double ctemp = Double.parseDouble(temp);text.setText(""+1/ctemp);}else if(str.equals("+/-")){if((text.getText().trim().indexOf("+")!=-1)||(text.getText().trim().indexOf("-")!=-1)){}else{String s="-";text.setText((buff.append(""+s)).toString());}}else if(str.equals("%")){buff.setLength(0);if(currentOp==0){preOp = currentOp = 5;op2 = 0;text.setText(""+op1);}else { currentOp = preOp; preOp = 5; switch(currentOp){ case 1:op1 += op2;text.setText(""+op1+"+");break; case 2:op1 -= op2;text.setText(""+op1);break; case 3:op1 *= op2;text.setText(""+op1);break; case 4:op1 /= op2;text.setText(""+op1);break; case 5:op1=Math.IEEEremainder(op1, op2);text.setText(""+op1);break; }}}else if(str.equals("sqrt")){String temp = text.getText().trim();Double ctemp = Double.parseDouble(temp);text.setText(""+Math.sqrt(ctemp));}else if(str.equals("+")){buff.setLength(0);if(currentOp==0) { preOp = currentOp = 1; op2 = 0; text.setText(""+op1); } else { currentOp = preOp; preOp = 1; switch(currentOp){ case 1:op1 += op2;text.setText(""+op1);break; case 2:op1 -= op2;text.setText(""+op1);break; case 3:op1 *= op2;text.setText(""+op1);break; case 4:op1 /= op2;text.setText(""+op1);break; case 5:op1=Math.IEEEremainder(op1, op2);text.setText(""+op1);break; } }}else if(str.equals("-")){buff.setLength(0);if(currentOp==0){preOp=currentOp=2;op2=0;text.setText(""+op1);}else{currentOp = preOp;preOp = 2;switch(currentOp){case 1:op1 += op2; text.setText(""+op1);break;case 2:op1 -= op2; text.setText(""+op1);break;case 3:op1 *= op2; text.setText(""+op1);break;case 4:op1 /= op2; text.setText(""+op1);break;case 5:op1=Math.IEEEremainder(op1, op2);text.setText(""+op1);break;}}}else if(str.equals("*")){buff.setLength(0);if(currentOp==0){preOp = currentOp = 3;op2 = 0;text.setText(""+op1);}else{currentOp = preOp;preOp = 3;switch(currentOp){case 1:op1 += op2; text.setText(""+op1);break;case 2:op1 -= op2; text.setText(""+op1);break;case 3:op1 *= op2; text.setText(""+op1);break;case 4:op1 /= op2; text.setText(""+op1);break;case 5:op1=Math.IEEEremainder(op1, op2);text.setText(""+op1);break;}}}else if(str.equals("/")){buff.setLength(0);if(currentOp==0){preOp = currentOp = 4;op2 = 0;text.setText(""+op1);}else{currentOp = preOp;preOp = 4;switch(currentOp){case 1:op1 += op2; text.setText(""+op1);break;case 2:op1 -= op2; text.setText(""+op1);break;case 3:op1 *= op2; text.setText(""+op1);break;case 4:op1 /= op2; text.setText(""+op1);break;case 5:op1=Math.IEEEremainder(op1, op2);text.setText(""+op1);break;}}}else if(str.equals("="))// = { if(currentOp==0) { buff.setLength(0); text.setText(""+op2); } else { buff.setLength(0); currentOp =preOp; switch(currentOp){ case 1:op1=op1+op2;text.setText(""+op1);break; case 2:op1=op1-op2;text.setText(""+op1);break; case 3:op1=op1*op2;text.setText(""+op1);break; case 4:op1=op1/op2;text.setText(""+op1);break; case 5:op1=Math.IEEEremainder(op1, op2);text.setText(""+op1);break; } currentOp=0; op2=0; } } else if(str.equals(".")){ isDouble=true; //text.setText((buff.append("0"+str)).toString());if(text.getText().trim().indexOf(".")!=-1){}else{text.setText((buff.append(""+str)).toString());/*if(text.getText().trim().equals("0")) { buff.setLength(0); text.setText((buff.append("0"+str)).toString()); if(text.getText().trim().equals("")){}//如果初时显示为空则不做任何操作 else { text.setText((buff.append(str)).toString()); } }*/}System.out.println(str);}else if(str.equals("0"))//如果选择的是"0"这个数字键 { if(text.getText().trim().equals("0.")){ text.setText(buff.append("0").toString()); } else{ text.setText(buff.append(str).toString()); op2=Double.parseDouble(text.getText().trim()); if(currentOp==0) op1=op2; } } else{ text.setText(buff.append(str).toString()); //append()将指定的字符串追加到此字符序列 op2=Double.parseDouble(text.getText().trim()); if(currentOp==0) op1=op2; }} public static void main(String[] args) {// TODO Auto-generated method stubCalculator frame = new Calculator();frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); frame.setSize(282,260); frame.setResizable(false); //setResizable(false)设置窗体不可改变大小 frame.setLocationRelativeTo(null); frame.setVisible(true);}}
效果:
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